| 摘要 |
PURPOSE:To improve a radiation effect and forming efficiency by forming wave-like concave and convex portions having equal pitch continuously disposed in the peripheral direction on the friction surface of a facing, and disposing a spiral concave groove on the concave-convex portion in such a manner as to substantially make a round. CONSTITUTION:Wave-like concave portions 3 and convex portions 4 continuously disposed in the peripheral direction are formed at equal spaces on the surface of a cluth facing 1. The concave portion 3 and the convex portion 4 make one set, which is divided into eight equal parts. The concave portion 3 and the convex portion 4 are expanded as they are directed from the inner peripheral end surface to the outer peripheral end surface. One concave groove 5 is formed extending from the inner peripheral end surface to the outer peripheral end surface on the friction surface of the facing. The concave groove 5 is formed spirally in the radial direction between the concave portion and the convex portion 4. |
